问题
单项选择题
叶暗绿色，生长延缓，下部叶的叶脉间黄化，表明缺（）的表现。
A.N
B.P
C.Na
D.Fe
答案
参考答案：B
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叶暗绿色，生长延缓，下部叶的叶脉间黄化，表明缺（）的表现。
A.N
B.P
C.Na
D.Fe
参考答案：B
My 8-year-old son, Kevin, has made friends with some boys in the neighborhood. He has been with them after school. My wife，Qugen, and I are he has other kids to be with and we have and encouraged him to play with his friends. We also want Kevin to learn _，so we have asked him to tell us he's going and to come home at a specified time. The started when Kevin didn't come home on time. On one occasion，I asked Kevin to be back at 6 pm. By 6：30，I needed to go him. I found him at a friend's house，and he looked that he couldn't continue playing. After we came home，I sat Kevin down for a talk about the of keeping his word. I told him I was not worried about him arriving a few late，but after half an hour，I’m going to be . He told me he understood. The next day，I came home from work at about 6:30 p.m. and Qugen asked me to go and get Kevin she said he should be back home at 6. I walked to his friend's house and a look of appeared on Kevin's face when he came to the door. At ，Qugen and I spoke to Kevin about why he didn't come home on time again. He said he just wanted to playing. This was ，so Qugen and I decided to ground(罚不准出门)him for a week. This no playing with his friends. For the next week，whenever his friends came to ask for Kevin，we let him to them that he was grounded. We felt this would help him be responsible for his . As a ，I believe one of the most important things we can teach our kids is self-responsibility and that actions have consequences.
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